Wrong power supply fried the amp?

[aristofane]

I have a Fosi Audio Q5 that works on 12V DC and Schiit Magni Heresy that works on 15V AC. They have the same power plug and I inverted the two cables, the Q5 wasn't working while the led of the Heresy was on, after I checked the power supplies and I figured out the mistake I swapped the cables and now the Q5 was working fine while the Heresy doesn't seem to turn on anymore.

Did I fry the amp? What component could have been damaged from the mistake? Is it reparable?

 

[Great Sun Jester]

I have a Fosi Audio Q5 that works on 12V DC and Schiit Magni Heresy that works on 15V AC. They have the same power plug and I inverted the two cables, the Q5 wasn't working while the led of the Heresy was on, after I checked the power supplies and I figured out the mistake I swapped the cables and now the Q5 was working fine while the Heresy doesn't seem to turn on anymore.

Did I fry the amp? What component could have been damaged from the mistake? Is it reparable?

Unfortunately they aren't called power 'bricks' for nothing. The only solution to the same sized inserts would be to mark each lead with masking tape saying Fosi and Schiit.

 

[Talisman]

I have a Fosi Audio Q5 that works on 12V DC and Schiit Magni Heresy that works on 15V AC. They have the same power plug and I inverted the two cables, the Q5 wasn't working while the led of the Heresy was on, after I checked the power supplies and I figured out the mistake I swapped the cables and now the Q5 was working fine while the Heresy doesn't seem to turn on anymore.

Did I fry the amp? What component could have been damaged from the mistake? Is it reparable?

Actually I don't think so, it would be strange for a lower voltage to cause damage, so I don't expect the underpowered Heresy to be damaged, if the FOSI had been damaged it would have made sense, but you wrote that going back to 12V it works regularly while the Heresy doesn't. .
The Heresy's 15V power supply may be damaged

I missed that they were 15V alternating current.... (what a strange choice) then I don't know, wait for someone more competent

 

[blackgate]

One of the reasons I avoid anything audio that is powered by a wall wart/brick.

 

[DonH56]

I would have expected the Fosi to be damaged if anything by having a large'ish AC power input rather than DC. Drop a note to Schiit and see what they say. There may be a fuse inside; I do not see anything on the exterior.

 

[wwenze]

15VAC supply going into a 12VDC equipment,

1) The reverse-polarity-protection diode will short the negative voltages straight to ground
2) Even in the absence of (1), feeding AC straight into a power supply capacitor is like feeding straight into a short

Grab a multimeter and see if the 15VAC is still alive.

I missed that they were 15V alternating current.... (what a strange choice) then I don't know, wait for someone more competent

Not uncommon if the designer needs to generate a ±voltage from a 2-pin supply.

 

[aristofane]

15VAC supply going into a 12VDC equipment,

1) The reverse-polarity-protection diode will short the negative voltages straight to ground
2) Even in the absence of (1), feeding AC straight into a power supply capacitor is like feeding straight into a short

Grab a multimeter and see if the 15VAC is still alive.



Not uncommon if the designer needs to generate a ±voltage from a 2-pin supply.

So maybe it's the power supply that is broken and not the amp itself?

 

[aristofane]

15VAC supply going into a 12VDC equipment,

1) The reverse-polarity-protection diode will short the negative voltages straight to ground
2) Even in the absence of (1), feeding AC straight into a power supply capacitor is like feeding straight into a short

Grab a multimeter and see if the 15VAC is still alive.



Not uncommon if the designer needs to generate a ±voltage from a 2-pin supply.

UPDATE: I've measured the output of the 15V power supply with a multimeter and it doesn't seem to have power, so maybe the amp is fine